New options --build-cache and --dry-run

Closes #11

2 files changed, 17 insertions, 3 deletions

diff --git a/internal/feed/cache.go b/internal/feed/cache.go
index df7559b..0b2f905 100644
--- a/internal/feed/cache.go
+++ b/internal/feed/cache.go
@@ -70,12 +70,16 @@ func storeCache(cache Cache, fileName string) error {
 	return nil
 }
 
+func newCache() (Cache, error) {
+	return cacheForVersion(currentVersion)
+}
+
 func loadCache(fileName string) (Cache, error) {
 	f, err := os.Open(fileName)
 	if err != nil {
 		if errors.Is(err, os.ErrNotExist) {
 			// no cache there yet -- make new
-			return cacheForVersion(currentVersion)
+			return newCache()
 		}
 		return nil, fmt.Errorf("opening cache at '%s': %w", fileName, err)
 	}
diff --git a/internal/feed/state.go b/internal/feed/state.go
index 154fafd..a060a77 100644
--- a/internal/feed/state.go
+++ b/internal/feed/state.go
@@ -34,8 +34,18 @@ func (state *State) ForeachGo(goFunc func(*Feed)) {
 	wg.Wait()
 }
 
-func (state *State) LoadCache(fileName string) error {
-	cache, err := loadCache(fileName)
+func (state *State) LoadCache(fileName string, forceNew bool) error {
+	var (
+		cache Cache
+		err   error
+	)
+
+	if forceNew {
+		cache, err = newCache()
+	} else {
+		cache, err = loadCache(fileName)
+	}
+
 	if err != nil {
 		return err
 	}